Material Drying
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ASA hygroscopic characteristics and drying necessity
Fenómeno del problema
[Problem phenomenon] ASA product surface silver streaks and bubbles, mistakenly believing low hygroscopicity allows skipping drying for direct production
Análisis de la causa
Although ASA has slightly lower hygroscopicity than ABS, it is still a hygroscopic material; moisture adsorbed on the pellet surface vaporizes during processing at 230-260°C; Plasthub clearly states ASA hygroscopicity requires light drying at 80°C×2-4h, otherwise residual moisture causes silver streaks
Solución
Dry at 80°C×2-4h before molding; in humid environments or long-opened bags, extend to 4h; desiccant dryer dew point below -30°C guarantees the endpoint; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusión clave
ASA light hygroscopicity is not a reason to skip drying, 80°C×2-4h is the silver streak defense line; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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